JP5234335B2 - Wide angle anti-vibration zoom lens - Google Patents
Wide angle anti-vibration zoom lens Download PDFInfo
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- JP5234335B2 JP5234335B2 JP2008147128A JP2008147128A JP5234335B2 JP 5234335 B2 JP5234335 B2 JP 5234335B2 JP 2008147128 A JP2008147128 A JP 2008147128A JP 2008147128 A JP2008147128 A JP 2008147128A JP 5234335 B2 JP5234335 B2 JP 5234335B2
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本発明は、ビデオカメラやデジタルスチルカメラ等において、複数の撮像素子を用いる方式のカメラに好適な２０倍程度の高倍率であって、さらに手振れ、振動等によって生じる像の振れを光学的に補正するズームレンズに関する。 The present invention is a high magnification of about 20 times suitable for a camera using a plurality of image sensors in a video camera, a digital still camera, etc., and further optically corrects image shake caused by camera shake, vibration, etc. It relates to a zoom lens.
複数の撮像素子を用いたカメラにおいては、バックフォーカスすなわちレンズの最後面から結像位置までの距離が長いことが要求される。被写体像を光電変換素子に光電変換するビデオカメラやデジタルスチルカメラに好適に使用できる広角ズームレンズとしては、正・負・正・正の屈折力配置を有する4群ズームレンズが知られている。 A camera using a plurality of image sensors is required to have a long back focus, that is, a long distance from the last surface of the lens to the imaging position. As a wide-angle zoom lens that can be suitably used for a video camera or a digital still camera that photoelectrically converts a subject image into a photoelectric conversion element, a four-group zoom lens having positive, negative, positive, and positive refractive power arrangements is known.
一方、ズーム比の大きなレンズ光学系においては、望遠端付近において画角が小さく像の拡大率が大きくなり、微小な手振れによっても大きな像振れが発生することになる。この像振れを補正する構成の一つは光学式手振れ補正機構であって、レンズ系の一部を光軸と直交する方向にシフトさせることによって、結像を像面内で光軸と直交する面内で移動させて手振れ補正を行う。 On the other hand, in a lens optical system with a large zoom ratio, the field angle is small near the telephoto end, the image enlargement ratio is large, and a large image blur is generated even by a minute camera shake. One of the configurations for correcting the image blur is an optical camera shake correction mechanism, and by shifting a part of the lens system in a direction orthogonal to the optical axis, the image formation is orthogonal to the optical axis in the image plane. Move in the plane to correct camera shake.
例えば、複数枚のレンズによって構成された第3レンズ群の一部の3枚レンズを光軸に対して垂直に移動させることにより、手振れによる像の移動を補正している（例えば、特許文献参照１）。
また、防振群が小型化を実現した例としては、複数枚のレンズによって構成された第3レンズ群の一部の2枚レンズを光軸に対して垂直に移動させるものが提案されている。
For example, the movement of the image due to camera shake is corrected by moving a part of the third lens group constituted by a plurality of lenses in a direction perpendicular to the optical axis (see, for example, Patent Documents). 1).
In addition, as an example in which the vibration-proof group has been reduced in size, there has been proposed one in which a part of the third lens group constituted by a plurality of lenses is moved vertically with respect to the optical axis. .
引用文献１のズームレンズにおいては、広角端から望遠端までレンズ位置が変化する際に、第２レンズ群が像側へ移動するとともに、第4群が像面位置の変動を補正するように移動し、第1群と第3群が光軸方向に固定され、正・負・正・正4成分のレンズで構成されており、第3レンズ群は負部分群と、負部分群の像側に配置された正部分群とにより構成され、正部分群を光軸に垂直な方向にシフトさせることで像を光軸に垂直な方向にシフトさせることが可能であり、以下の数値規定を特徴としている。
即ち、次の条件式
1）1.4＜｜ｆ3ｎ｜／ｆ3＜3
2）-0.3＜（Rn＋Rp）／（Rn−Rp）＜0.3
3）0＜（Rp1＋Rｐ2）／（Rp1−Rp2）＜2
4）0.42＜｜ｆ2｜／（ｆｗ・ｆｔ）1/2＜0.5
5) 0.8＜Dt／Z2＜1.2
但し
ｆ3ｎ ：第3レンズ群中に配置される負部分群の焦点距離
ｆ2 ：第2レンズ群の焦点距離
ｆ3 ：第3レンズ群の焦点距離
ｆw ：広角端状態におけるレンズ
Rp1 ：第3レンズ群中に正部分群の最も像側に配置される正レンズの物体側レンズ面の
曲率半径
Rp2 ：第3レンズ群中に正部分群の最も像側に配置される正レンズの像側レンズ面の
曲率半径
Dt ：望遠端状態において開口絞りから第4レンズ群の最も像面側のレンズ面までの
光軸に沿った距離
Z2 ：広角端状態から望遠端状態までレンズ位置状態が変化する際の第2レンズ群の
移動量
である。
In the zoom lens of Cited Document 1, when the lens position changes from the wide-angle end to the telephoto end, the second lens group moves to the image side, and the fourth group moves so as to correct the fluctuation of the image plane position. The first group and the third group are fixed in the optical axis direction and consist of positive, negative, positive, and positive four component lenses. The third lens group consists of the negative subgroup and the image side of the negative subgroup. It is possible to shift the image in the direction perpendicular to the optical axis by shifting the positive subgroup in the direction perpendicular to the optical axis. It is said.
That is, the following conditional expression
1) 1.4 <| f3n | / f3 <3
2) -0.3 <(Rn + Rp) / (Rn-Rp) <0.3
3) 0 <(Rp1 + Rp2) / (Rp1-Rp2) <2
4) 0.42 <| f2 | / (fw · ft) 1/2 <0.5
5) 0.8 <Dt / Z2 <1.2
Where f3n: focal length of the negative subgroup arranged in the third lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: lens in the wide-angle end state
Rp1: The radius of curvature of the object-side lens surface of the positive lens arranged closest to the image side of the positive subgroup in the third lens group
Rp2: radius of curvature of the image side lens surface of the positive lens arranged closest to the image side of the positive subgroup in the third lens group
Dt: Distance along the optical axis from the aperture stop to the lens surface closest to the image plane of the fourth lens group in the telephoto end state
Z2: The amount of movement of the second lens group when the lens position changes from the wide-angle end state to the telephoto end state.
引用文献１のズームレンズにおいては、第3レンズ群中の負部分群と正部分群で構成し、その正部分群を3枚のレンズで構成しているため、負部分群より有効径の大きいレンズ3枚の重量が重たいため、手振れ補正の機構が大型化し、消費電力が大きくなるという問題があった。 In the zoom lens of Cited Document 1, the third lens group is composed of a negative subgroup and a positive subgroup, and the positive subgroup is composed of three lenses, so the effective diameter is larger than that of the negative subgroup. Since the three lenses are heavy, there is a problem that the camera shake correction mechanism is enlarged and power consumption is increased.
引用文献２のズームレンズにおいては、広角端から望遠端までレンズ位置が変化する際に、第２レンズ群が像側へ移動するとともに、第4群が像面位置の変動を補正するように移動し、第1群と第3群が光軸方向に固定され、正・負・正・正4成分のレンズで構成されており、第3レンズ群は負部分群と、負部分群の像側に配置された正部分群とにより構成され、正部分群を光軸に垂直な方向にシフトさせることで像を光軸に垂直な方向にシフトさせることが可能であり、以下の数値規定を特徴としている。
即ち、次の条件式
を満足することを特徴する4群ズームレンズ。
1）1.2＜｜ｆ3ｎ｜／ｆ4
2）0.9＜ｆ3ｐ／ｆ4
3）0.2＜｜1/Ra＋1/Rb｜・ｆｗ＜0.4
但し
ｆ3ｎ ：第3レンズ群中に配置される負部分群の焦点距離
ｆ3ｐ ：第3レンズ群中に配置される正部分群の焦点距離
ｆ4 ：第4レンズ群の焦点距離
ｆw ：広角端状態におけるレンズ全系での焦点距離
Ra ：第3レンズ群中に配置される負部分群中の負レンズの物体側レンズ面の曲率半径
Rb ：第3レンズ群中に配置される負部分群中の正レンズの物体側レンズ面の曲率半径
In the zoom lens of Cited Document 2, when the lens position changes from the wide-angle end to the telephoto end, the second lens group moves toward the image side, and the fourth group moves so as to correct the variation in the image plane position. The first group and the third group are fixed in the optical axis direction and consist of positive, negative, positive, and positive four component lenses. The third lens group consists of the negative subgroup and the image side of the negative subgroup. It is possible to shift the image in the direction perpendicular to the optical axis by shifting the positive subgroup in the direction perpendicular to the optical axis. It is said.
That is, a four-group zoom lens that satisfies the following conditional expression:
1) 1.2 <| f3n | / f4
2) 0.9 <f3p / f4
3) 0.2 <| 1 / Ra + 1 / Rb | ・ fw <0.4
Where f3n: focal length of the negative sub-group arranged in the third lens group f3p: focal length of the positive sub-group arranged in the third lens group f4: focal length of the fourth lens group fw: in the wide-angle end state Focal length of the entire lens system
Ra: radius of curvature of the object side lens surface of the negative lens in the negative sub-group arranged in the third lens group
Rb: radius of curvature of the object side lens surface of the positive lens in the negative subgroup arranged in the third lens group
引用文献２のズームレンズにおいては、第3レンズ群中の負部分群と正部分群で構成し、その正部分群を2枚接合レンズで構成しているが、負部分群より有効径の大きいレンズ2枚の重量が重たいため、手振れ補正の機構が大型化し、消費電力が大きくなるという問題があった。 In the zoom lens of the cited document 2, it is composed of a negative subgroup and a positive subgroup in the third lens group, and the positive subgroup is composed of two cemented lenses, but has a larger effective diameter than the negative subgroup. Since the two lenses are heavy, there is a problem that the camera shake correction mechanism becomes large and power consumption increases.
引用文献３のズームレンズにおいては、物体側より正、負、正、正の4群構成のズームレンズで、第3レンズ群は、固定の負レンズ群と光軸に垂直な方向に移動可能で光軸のブレによる像の移動を補正できる正部分群とからなる、以下の数値規定を特徴としている。
すなわち、次の条件式を満足することを特徴する4群ズームレンズ。
1）-2＜SAB・FN2・ｆｗ／ｆ32＜-0.1
2）-0.9＜SAA／SAB＜-0.003
3）｜S2／ｆ31｜ ≦ 0.15
4）S2／ｆ32 ≦ 0.2
但し
ｆｗ ：レンズ全系の広角端での焦点距離
FN ：レンズ全系の広角端での開放Fナンバー
SAA ：第3レンズ群中に配置される負部分群の非球面をその近軸球面に置き換えたとき
の広角端で開放Fナンバーにおけるレンズ系の球面収差量の値
SAB ：第3レンズ群中に配置される正部分群の非球面をその近軸球面に置き換えたとき
の広角端で開放Fナンバーにおけるレンズ系の球面収差量の値
ｆ31 ：第3レンズ群中に配置される負部分群の焦点距離
ｆ32 ：第3レンズ群中に配置される正部分群の焦点距離
S2 ：望遠端における第2レンズ群と第3レンズ群との間の空気間隔
In the zoom lens of the cited document 3, the zoom lens has four groups of positive, negative, positive, and positive from the object side, and the third lens group can move in a direction perpendicular to the fixed negative lens group and the optical axis. It is characterized by the following numerical definition consisting of a positive subgroup capable of correcting image movement due to optical axis blurring.
That is, a four-group zoom lens that satisfies the following conditional expression:
1) -2 <SAB ・ FN 2・ fw / f32 <-0.1
2) -0.9 <SAA / SAB <-0.003
3) | S2 / f31 | ≤ 0.15
4) S2 / f32 ≤ 0.2
Fw: Focal length at the wide-angle end of the entire lens system
FN: Open F-number at the wide-angle end of the entire lens system
SAA: The value of the spherical aberration of the lens system at the wide-angle end and the open F-number when the aspherical surface of the negative subgroup arranged in the third lens group is replaced with its paraxial spherical surface
SAB: The value of the spherical aberration of the lens system at the wide-angle end and the open F-number when the aspherical surface of the positive subgroup arranged in the third lens group is replaced with its paraxial spherical surface f31: In the third lens group Focal length f32 of the negative subgroup arranged: Focal length of the positive subgroup arranged in the third lens group
S2: Air distance between the second lens group and the third lens group at the telephoto end
引用文献３のズームレンズにおいては、第3レンズ群中の絞りの物体側の負部分群と絞りの像側の正部分群で構成し、その正部分群を2枚のレンズで構成しているが、負部分群より有効径の大きいレンズ2枚の重量が重たいため、手振れ補正の機構が大型化し、消費電力が大きくなるという問題があった。 In the zoom lens of the cited document 3, the third lens unit is composed of a negative part group on the object side of the diaphragm and a positive part group on the image side of the diaphragm, and the positive part group is composed of two lenses. However, since the two lenses having a larger effective diameter are heavier than the negative subgroup, there is a problem that the camera shake correction mechanism is enlarged and power consumption is increased.
（発明の目的）
本発明は、従来の複数の撮像素子を用いる方式のカメラの高倍率で、さらに手振れ、振動等によって生じる像の振れを光学的に補正するズームレンズに関する上述した問題点に鑑みなされたものであって、諸収差が良好補正されたズーム倍率20倍程度のズームレンズを提供することを目的とする。
本発明はまた、防振群を小型化し小さい駆動エネルギーで作動し、かつ全ズーム域で諸収差をバランスよく補正されたズームレンズを提供することを目的とする。
(Object of invention)
The present invention has been made in view of the above-described problems related to a zoom lens that optically corrects image shake caused by camera shake, vibration, etc. at a high magnification of a conventional camera using a plurality of image sensors. Thus, an object of the present invention is to provide a zoom lens having a zoom magnification of about 20 times in which various aberrations are well corrected.
Another object of the present invention is to provide a zoom lens in which the vibration-proof group is reduced in size and operates with a small drive energy, and various aberrations are corrected in a balanced manner over the entire zoom range.
本発明は、物体側から像面側に向けて順に、正の屈折力の第１レンズ群Ｇ1、負の屈折力の第２レンズ群Ｇ2、正の屈折力の第３レンズ群Ｇ3、正の屈折力の第4レンズ群Ｇ4の少なくとも4つのレンズ群より成り、広角端から望遠端までレンズ位置が変化する際に、上記の第2レンズ群Ｇ2が像側へ移動すると共に、上記の第4レンズ群Ｇ4が像面位置の変動を補償するように移動し、上記の第1レンズ群Ｇ1と第3レンズ群Ｇ3が光軸方向に固定され、
上記第3レンズ群は凸凹接合レンズの固定群L31と凹凸接合レンズ群L32とにより構成され、L32を光軸に垂直な方向にシフトすることにより、像をシフトさせ、また、前記固定群L31は、最も物体側に強い凸面を向け、最も像面側に強い凹面を向けて構成され、
条件式（１） H31＞H32
H31：広角端で3群の固定群の最も物体側レンズ面の軸上の上光線の入射光線高さ
H32：広角端で3群の防振群の最も物体側レンズ面の軸上の上光線の入射光線高さ
条件式（２） −0.12＜（R31−R32）／（R31＋R32）＜0.12
R31：第3レンズ群の固定群の最も物体側の凸面の曲率半径
R32：第3レンズ群の固定群の最も像面側の凹面の曲率半径
を満たす広角防振ズームレンズである。
In the present invention, in order from the object side to the image plane side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a positive lens When the lens position changes from the wide-angle end to the telephoto end, the second lens group G2 moves toward the image side and the fourth lens group is formed. The lens group G4 moves so as to compensate for variations in the image plane position, and the first lens group G1 and the third lens group G3 are fixed in the optical axis direction.
The third lens group is composed of a convex-concave cemented lens fixed group L31 and a concave-convex cemented lens group L32.The image is shifted by shifting L32 in a direction perpendicular to the optical axis, and the fixed group L31 is , With the strong convex surface facing the most object side and the strong concave surface facing the most image side,
Conditional expression (1) H31> H32
H31: Incident ray height of the upper ray on the axis of the most object side lens surface of the three fixed groups at the wide angle end
H32: Incident ray height of the upper ray on the axis of the most object side lens surface of the three anti-vibration groups at the wide angle end Conditional expression (2) −0.12 <(R31−R32) / (R31 + R32) <0.12
R31: Radius of curvature of the convex surface closest to the object side in the fixed group of the third lens group
R32: A wide-angle image stabilization zoom lens that satisfies the radius of curvature of the concave surface closest to the image plane in the fixed group of the third lens group.
本発明の実施形態は、以下のとおりである。
コマ収差と球面収差を補正するため、第3レンズ群の固定群L31の少なくとも1面が非球面である。
Embodiments of the present invention are as follows.
In order to correct coma and spherical aberration, at least one surface of the fixed group L31 of the third lens group is aspheric.
（条件式の説明）
条件式（１）は、防振群レンズの有効径を小さくするためのものである。条件式（１）を満たさない場合、防振群レンズを大きな直径としなければならず、広角防振ズームレンズの大型化重量化に加えて、防振駆動系の駆動力を大きくしなければならない問題が発生する。
条件式（２）は、防振群の有効径を小さく抑えつつ、コマ収差と球面収差を良好に補正するためのものである。条件式（2）の下限を超えると、防振群のパワーが弱くなって、シフト量が大きくなり、続く後群の肥大化を招き、小型化に不利となる。条件式（2）の上限を超えると、防振群のパワーが強くなって、コマ収差と球面収差の補正が困難となる。
(Explanation of conditional expressions)
Conditional expression (1) is for reducing the effective diameter of the image stabilizing group lens. When the conditional expression (1) is not satisfied, the vibration-proof group lens must have a large diameter, and in addition to increasing the size and weight of the wide-angle vibration-proof zoom lens, the driving force of the vibration-proof drive system must be increased. A problem occurs.
Conditional expression (2) is for satisfactorily correcting coma and spherical aberration while keeping the effective diameter of the image stabilizing group small. If the lower limit of conditional expression (2) is exceeded, the power of the anti-vibration group becomes weak and the shift amount becomes large, leading to subsequent enlargement of the rear group, which is disadvantageous for downsizing. If the upper limit of conditional expression (2) is exceeded, the power of the anti-vibration group will increase, making it difficult to correct coma and spherical aberration.
本発明の広角防振ズームレンズによれば、撮像素子を用いる方式のカメラの高倍率で、さらに手振れ、振動等によって生じる像の振れを光学的に補正し、諸収差が全ズーム域でバランスよく良好に補正され、防振群を小型化し小さい駆動エネルギーで駆動できる広角防振ズームレンズを構成することができる。 According to the wide-angle anti-vibration zoom lens of the present invention, the high-power magnification of the camera using the image pickup device is further optically corrected for image shake caused by camera shake, vibration, etc., and various aberrations are well balanced in the entire zoom range. A wide-angle anti-vibration zoom lens that is well corrected and can be driven with small drive energy by reducing the size of the anti-vibration group can be configured.
（第１実施形態）
第１実施形態の広角防振ズームレンズの数値データは、表１に、最短焦点距離を１ｍｍに正規化して示される。表１において、Ｓは面番号、ＡＳＰＨは非球面、Ｒは曲率半径（ｍｍ）、Ｄは厚さまたは間隔（ｍｍ）、Ｎｄはｄ線（λ＝５８７．６nｍ）の屈折率、ＡＢνはｄ線に対するアッベ数である。
(First embodiment)
Numerical data of the wide-angle image stabilizing zoom lens according to the first embodiment is shown in Table 1 with the shortest focal length normalized to 1 mm. In Table 1, S is a surface number, ASPH is an aspheric surface, R is a radius of curvature (mm), D is a thickness or interval (mm), Nd is a refractive index of d-line (λ = 587.6 nm), and ABν is d Abbe number for the line.
非球面は、
ｚ：非球面深さ
ｙ：高さ
Ｒ：近軸曲率半径
Ｋ、Ａ、Ｂ、Ｃ、Ｄ：非球面係数
で表され、表１に示される非球面係数を有する。
An aspheric surface is
z: aspheric depth y: height R: paraxial radius of curvature K, A, B, C, D: represented by aspheric coefficients and having the aspheric coefficients shown in Table 1.
（表１）
S R D Nd ABV
1 185.6556 0.4028 1.90366 31.31
2 13.4778 2.8310 1.49700 81.61
3 -45.0882 0.0355
4 14.5207 1.5745 1.72916 54.67
5 73.3948 0.0355
6 16.5815 1.0146 1.83481 42.72
7 41.1397 (D7)
8 ASPH 13.3663 0.0474 1.53610 41.20
9 10.7661 0.1896 1.88300 40.80
10 2.2512 1.7006
11 -3.6114 0.1422 1.62004 36.30
12 5.0993 0.7808 1.94595 17.98
13 -21.4719 (D13)
絞り 0.0000 1.1848
15 ASPH 4.4935 0.8294 1.68893 31.16
16 -29.5955 0.4739 1.83400 37.34
17 4.7393 0.3324
18 5.8020 0.1185 1.80610 33.27
19 3.6662 0.7453 1.48749 70.44
20 -28.9053 (D20)
21 ASPH 3.3229 1.4828 1.69350 53.34
22 ASPH -6.7610 0.0355
23 -13.9305 0.1185 1.83400 37.34
24 2.4849 1.3766 1.49700 81.61
25 -7.4707 (D25)
26 0.0000 0.1019 1.51680 64.20
27 0.0000 0.4645 1.61800 63.39
28 0.0000 0.2915
29 0.0000 0.4028 1.51680 64.20
30 0.0000 3.6730 1.51680 64.20
31 0.0000
(Table 1)
SRD Nd ABV
1 185.6556 0.4028 1.90366 31.31
2 13.4778 2.8310 1.49700 81.61
3 -45.0882 0.0355
4 14.5207 1.5745 1.72916 54.67
5 73.3948 0.0355
6 16.5815 1.0146 1.83481 42.72
7 41.1397 (D7)
8 ASPH 13.3663 0.0474 1.53610 41.20
9 10.7661 0.1896 1.88300 40.80
10 2.2512 1.7006
11 -3.6114 0.1422 1.62004 36.30
12 5.0993 0.7808 1.94595 17.98
13 -21.4719 (D13)
Aperture 0.0000 1.1848
15 ASPH 4.4935 0.8294 1.68893 31.16
16 -29.5955 0.4739 1.83400 37.34
17 4.7393 0.3324
18 5.8020 0.1185 1.80610 33.27
19 3.6662 0.7453 1.48749 70.44
20 -28.9053 (D20)
21 ASPH 3.3229 1.4828 1.69350 53.34
22 ASPH -6.7610 0.0355
23 -13.9305 0.1185 1.83400 37.34
24 2.4849 1.3766 1.49700 81.61
25 -7.4707 (D25)
26 0.0000 0.1019 1.51680 64.20
27 0.0000 0.4645 1.61800 63.39
28 0.0000 0.2915
29 0.0000 0.4028 1.51680 64.20
30 0.0000 3.6730 1.51680 64.20
31 0.0000
非球面係数
NO 8
K :0.000000
A :0.289736E-02 B :-.207478E-03 C :0.990963E-05 D :-.781114E-06
NO 15
K :0.000000
A :-.963562E-04 B :-.376299E-05 C :-.886104E-05 D :0.116385E-05
NO 21
K :0.000000
A :-.777717E-03 B :-.305060E-03 C :0.758612E-04 D :0.405168E-05
NO 22
K :0.000000
A :0.543664E-02 B :-.931646E-03 C :0.340591E-03 D :-.317582E-04
Aspheric coefficient
NO 8
K: 0.000000
A: 0.289736E-02 B:-. 207478E-03 C: 0.990963E-05 D:-. 781114E-06
NO 15
K: 0.000000
A:-. 963562E-04 B:-. 376299E-05 C:-. 886104E-05 D: 0.116385E-05
NO 21
K: 0.000000
A:-. 777717E-03 B:-. 305060E-03 C: 0.758612E-04 D: 0.405168E-05
NO 22
K: 0.000000
A: 0.543664E-02 B:-. 931646E-03 C: 0.340591E-03 D:-. 317582E-04
焦点距離 1.000 4.343 19.082
Ｆナンバー 1.6500 2.600 3.600
2ω 76.512 19.236 4.476
D7 0.1659 8.0156 12.0596
D13 12.3677 4.5178 0.4739
D20 3.3875 2.1578 2.1485
D25 0.4229 1.6528 1.6620
Focal length 1.000 4.343 19.082
F number 1.6500 2.600 3.600
2ω 76.512 19.236 4.476
D7 0.1659 8.0156 12.0596
D13 12.3677 4.5178 0.4739
D20 3.3875 2.1578 2.1485
D25 0.4229 1.6528 1.6620
第１実施形態の広角防振ズームレンズは、図１に示すように、ズーム作動によって第２レンズ群Ｇ２ないし第４レンズ群Ｇ４が移動する。表１のＤ７，Ｄ１３，Ｄ２０，Ｄ２５は、ズーム作動における各焦点距離における間隔を示す。図1（ａ）は焦点距離１（ｍｍ）の状態を示し、図1（ｂ）は焦点距離４．３４３（ｍｍ）の状態を示し、図1（ｃ）は焦点距離１９．０８２８（ｍｍ）の状態を示す。 As shown in FIG. 1, the wide-angle image stabilization zoom lens according to the first embodiment moves the second lens group G2 to the fourth lens group G4 by a zoom operation. D7, D13, D20, and D25 in Table 1 indicate intervals at respective focal lengths in the zoom operation. FIG. 1 (a) shows a state with a focal length of 1 (mm), FIG. 1 (b) shows a state with a focal length of 4.343 (mm), and FIG. 1 (c) shows a focal length of 19.0828 (mm). Shows the state.
第１実施形態の広角防振ズームレンズの収差を、図２ないし図６に示す。図２ないし図６において、ＣはＣ線（６５６．２８ｎｍ）を示し、ｄはｄ線（５８７．５６ｎｍ）を示し、ｅはｅ線（５４６．０７ｎｍ）を示し、ＦはＦ線（４８６．１３ｎｍ）を示し、ｇはｇ線（４３５．８４ｎｍ）を示す。
図２は、広角端（焦点距離１ｍｍ）における収差を示し、（ａ）は球面収差、（ｂ）は非点収差、（ｃ）は歪曲収差を示す。
図３は、望遠端（焦点距離１９．０８２ｍｍ）における収差を示し、（ａ）は球面収差、（ｂ）は非点収差、（ｃ）は歪曲収差を示す。
The aberrations of the wide-angle image stabilization zoom lens of the first embodiment are shown in FIGS. 2 to 6, C represents a C line (656.28 nm), d represents a d line (587.56 nm), e represents an e line (546.07 nm), and F represents an F line (486.28 nm). 13 nm) and g indicates g-line (435.84 nm).
FIG. 2 shows aberrations at the wide-angle end (focal length 1 mm), (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.
FIG. 3 shows aberrations at the telephoto end (focal length 19.082 mm), (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.
図４は、広角端（焦点距離１ｍｍ）におけるコマ収差を示し、（ａ）は入射角度（半画角）３８．２５°、（ｂ）は入射角度（半画角）２８．５８°、（ｃ）は入射角度（半画角）２０．９３°、（ｄ）は入射角度（半画角）０°である。 FIG. 4 shows coma aberration at the wide angle end (focal length 1 mm), (a) is an incident angle (half angle of view) 38.25 °, (b) is an incident angle (half angle of view) 28.58 °, ( c) is an incident angle (half angle of view) of 20.93 °, and (d) is an incident angle (half angle of view) of 0 °.
図５は、望遠端（焦点距離１９．０８２ｍｍ）におけるコマ収差を示し、（ａ）は入射角度（半画角）２．２３８°、（ｂ）は入射角度（半画角）１．５６６°、（ｃ）は入射角度（半画角）１．１１９°、（ｄ）は入射角度（半画角）０°である。 FIG. 5 shows coma aberration at the telephoto end (focal length 19.082 mm), (a) is an incident angle (half angle of view) 2.238 °, and (b) is an incident angle (half angle of view) 1.566 °. , (C) is an incident angle (half angle of view) of 1.119 °, and (d) is an incident angle (half angle of view) of 0 °.
第１実施形態の広角防振ズームレンズの条件式の値は、次のとおりである。
条件式（１） H31＞H32
条件式（２） （R31−R32）／（R31＋R32）＝−０．０２６６
The values of the conditional expressions of the wide-angle image stabilizing zoom lens according to the first embodiment are as follows.
Conditional expression (1) H31> H32
Conditional expression (2) (R31−R32) / (R31 + R32) = − 0.0266
（第２実施形態）
第２実施形態の広角防振ズームレンズの数値データは、表１に準じた表２に、最短焦点距離を１ｍｍに正規化して示される。
(Second Embodiment)
Numerical data of the wide-angle image stabilizing zoom lens according to the second embodiment is shown in Table 2 according to Table 1 with the shortest focal length normalized to 1 mm.
（表２）
S R D Nd ABV
1 187.9572 0.3910 1.90366 31.31
2 14.5051 2.5979 1.49700 81.61
3 -43.7127 0.0355
4 14.6879 1.5034 1.72916 54.67
5 84.1369 0.0355
6 16.2351 0.8569 1.83481 42.72
7 32.0543 (D7)
8 ASPH 13.9932 0.0474 1.53610 41.20
9 10.1102 0.1896 1.88300 40.80
10 2.1564 1.5658
11 -3.2917 0.1422 1.88300 40.80
12 -14.2180 0.0355
13 25.7072 0.1422 1.90366 31.31
14 9.7156 0.6672 1.94595 17.98
15 -9.7156 (D15)
絞り 0.0000 1.1848
17 3.9627 0.7054 1.66680 33.05
18 72.3795 0.2133 1.81474 37.03
19 ASPH 4.3789 0.4823
20 8.9702 0.1422 1.80610 33.27
21 5.3991 0.7017 1.48749 70.44
22 -14.5476 (D22)
23 ASPH 3.4274 1.5403 1.69350 53.34
24 ASPH -8.8883 0.0355
25 -19.9651 0.1422 1.83400 37.34
26 2.4171 1.1256 1.49700 81.61
27 -7.6964 (D27)
28 0.0000 0.1019 1.51680 64.20
29 0.0000 0.4645 1.61800 63.39
30 0.0000 0.2915
31 0.0000 0.4028 1.51680 64.20
32 0.0000 3.6730 1.51680 64.20
33 0.0000
(Table 2)
SRD Nd ABV
1 187.9572 0.3910 1.90366 31.31
2 14.5051 2.5979 1.49700 81.61
3 -43.7127 0.0355
4 14.6879 1.5034 1.72916 54.67
5 84.1369 0.0355
6 16.2351 0.8569 1.83481 42.72
7 32.0543 (D7)
8 ASPH 13.9932 0.0474 1.53610 41.20
9 10.1102 0.1896 1.88300 40.80
10 2.1564 1.5658
11 -3.2917 0.1422 1.88300 40.80
12 -14.2180 0.0355
13 25.7072 0.1422 1.90366 31.31
14 9.7156 0.6672 1.94595 17.98
15 -9.7156 (D15)
Aperture 0.0000 1.1848
17 3.9627 0.7054 1.66680 33.05
18 72.3795 0.2133 1.81474 37.03
19 ASPH 4.3789 0.4823
20 8.9702 0.1422 1.80610 33.27
21 5.3991 0.7017 1.48749 70.44
22 -14.5476 (D22)
23 ASPH 3.4274 1.5403 1.69350 53.34
24 ASPH -8.8883 0.0355
25 -19.9651 0.1422 1.83400 37.34
26 2.4171 1.1256 1.49700 81.61
27 -7.6964 (D27)
28 0.0000 0.1019 1.51680 64.20
29 0.0000 0.4645 1.61800 63.39
30 0.0000 0.2915
31 0.0000 0.4028 1.51680 64.20
32 0.0000 3.6730 1.51680 64.20
33 0.0000
非球面係数
NO 8
K :0.000000
A :0.441430E-02 B :-.302347E-03 C :0.942323E-05 D :-.779714E-06
NO 19
K :0.000000
A :0.619937E-03 B :0.238222E-04 C :0.207710E-05 D :0.520394E-06
NO 23
K :0.000000 KC : 100
A :-.472346E-03 B :-.153297E-03 C :0.316449E-04 D :0.293466E-05
NO 24
K :0.000000 KC : 100
A :0.389191E-02 B :-.346053E-03 C :0.935950E-04 D :-.330355E-05
Aspheric coefficient
NO 8
K: 0.000000
A: 0.441430E-02 B:-. 302347E-03 C: 0.942323E-05 D:-. 779714E-06
NO 19
K: 0.000000
A: 0.619937E-03 B: 0.238222E-04 C: 0.207710E-05 D: 0.520394E-06
NO 23
K: 0.000000 KC: 100
A:-. 472346E-03 B:-. 153297E-03 C: 0.316449E-04 D: 0.293466E-05
NO 24
K: 0.000000 KC: 100
A: 0.389191E-02 B:-. 346053E-03 C: 0.935950E-04 D:-. 330355E-05
焦点距離 1.0000 4.5023 19.1001
Ｆナンバー 1.6500 2.5600 3.5000
2ω 76.702 18.512 4.477
D7 0.21327 8.50533 12.52530
D15 12.78615 4.49412 0.47393
D22 3.69930 2.34682 2.09961
D27 0.61417 1.96649 2.21405
Focal length 1.0000 4.5023 19.1001
F number 1.6500 2.5600 3.5000
2ω 76.702 18.512 4.477
D7 0.21327 8.50533 12.52530
D15 12.78615 4.49412 0.47393
D22 3.69930 2.34682 2.09961
D27 0.61417 1.96649 2.21405
第２実施形態の広角防振ズームレンズは、図６に示すように、ズーム作動によって第２レンズ群Ｇ２ないし第４レンズ群Ｇ４が移動する。表２のＤ７，Ｄ１５，Ｄ２２，Ｄ２７は、ズーム作動における各焦点距離における間隔を示す。図６（ａ）は焦点距離１（ｍｍ）の状態を示し、図６（ｂ）は焦点距離４．５０２３（ｍｍ）の状態を示し、図６（ｃ）は焦点距離１９．１００１（ｍｍ）の状態を示す。 As shown in FIG. 6, in the wide-angle image stabilizing zoom lens according to the second embodiment, the second lens group G2 to the fourth lens group G4 are moved by the zoom operation. D7, D15, D22, and D27 in Table 2 indicate intervals at each focal length in the zoom operation. 6A shows the state of the focal length 1 (mm), FIG. 6B shows the state of the focal length 4.5023 (mm), and FIG. 6C shows the focal length 19.1001 (mm). Shows the state.
第２実施形態の広角防振ズームレンズの収差を、図２ないし図５に準じた図７ないし図１０に示す。
図７は、広角端（焦点距離１ｍｍ）における収差を示し、（ａ）は球面収差、（ｂ）は非点収差、（ｃ）は歪曲収差を示す。
図８は、望遠端（焦点距離１９．１００１ｍｍ）における収差を示し、（ａ）は球面収差、（ｂ）は非点収差、（ｃ）は歪曲収差を示す。
Aberrations of the wide-angle image stabilizing zoom lens according to the second embodiment are shown in FIGS. 7 to 10 according to FIGS.
FIG. 7 shows aberrations at the wide-angle end (focal length 1 mm), (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.
FIG. 8 shows aberrations at the telephoto end (focal length 19.1001 mm), (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.
図９は、広角端（焦点距離１ｍｍ）におけるコマ収差を示し、（ａ）は入射角度（半画角）３８．３５°、（ｂ）は入射角度（半画角）２８．５５°、（ｃ）は入射角度（半画角）２０．９２°、（ｄ）は入射角度（半画角）０°である。 FIG. 9 shows coma aberration at the wide angle end (focal length 1 mm), (a) is an incident angle (half angle of view) 38.35 °, (b) is an incident angle (half angle of view) 28.55 °, ( c) is an incident angle (half angle of view) of 20.92 °, and (d) is an incident angle (half angle of view) of 0 °.
図１０は、望遠端（焦点距離１９．１００１ｍｍ）におけるコマ収差を示し、（ａ）は入射角度（半画角）２．２３８°、（ｂ）は入射角度（半画角）１．５６５°、（ｃ）は入射角度（半画角）１．１１９°、（ｄ）は入射角度（半画角）０°である。 FIG. 10 shows coma aberration at the telephoto end (focal length 19.1001 mm), (a) is an incident angle (half angle of view) 2.238 °, and (b) is an incident angle (half angle of view) 1.565 °. , (C) is an incident angle (half angle of view) of 1.119 °, and (d) is an incident angle (half angle of view) of 0 °.
第２実施形態の広角防振ズームレンズの条件式の値は、次のとおりである。
条件式（１） H31＞H32
条件式（２） （R31−R32）／（R31＋R32）＝−０．０４９９
The values of the conditional expressions of the wide-angle image stabilizing zoom lens according to the second embodiment are as follows.
Conditional expression (1) H31> H32
Conditional expression (2) (R31−R32) / (R31 + R32) = − 0.0499
（第３実施形態）
第３実施形態の広角防振ズームレンズの数値データは、表１に準じた表３に、最短焦点距離を１ｍｍに正規化して示される。
(Third embodiment)
Numerical data of the wide-angle image stabilization zoom lens according to the third embodiment is shown in Table 3 according to Table 1 with the shortest focal length normalized to 1 mm.
（表３）
S R D Nd ABV
1 187.2038 0.4028 1.90366 31.31
2 14.5735 2.5960 1.49700 81.61
3 -44.7867 0.0355
4 14.7986 1.5404 1.72916 54.67
5 95.9716 0.0355
6 16.3270 0.8559 1.83481 42.72
7 31.2796 (D7)
8 ASPH 17.6748 0.0474 1.53610 41.20
9 11.7523 0.1896 1.88300 40.80
10 2.1934 1.5313
11 -3.3743 0.1422 1.88300 40.80
12 -14.2180 0.0355
13 26.5108 0.1422 1.90366 31.31
14 9.6641 0.6703 1.94595 17.98
15 -9.6641 (D15)
絞り 0.0000 1.1848
17 ASPH 3.4609 0.7833 1.68893 31.16
18 44.0876 0.1422 1.80610 33.27
19 3.6180 0.5368
20 8.0360 0.1422 1.80610 33.27
21 4.9364 0.7131 1.48749 70.44
22 -15.9885 3.6402
23 ASPH 3.3850 1.5006 1.69350 53.34
24 ASPH -8.8783 0.0355
25 -20.0260 0.1422 1.83400 37.34
26 2.4171 1.1653 1.49700 81.61
27 -7.7420 (D27)
28 0.0000 0.1019 1.51680 64.20
29 0.0000 0.4645 1.61800 63.39
30 0.0000 0.2915
31 0.0000 0.4028 1.51680 64.20
32 0.0000 3.6730 1.51680 64.20
33 0.0000 0.00
(Table 3)
SRD Nd ABV
1 187.2038 0.4028 1.90366 31.31
2 14.5735 2.5960 1.49700 81.61
3 -44.7867 0.0355
4 14.7986 1.5404 1.72916 54.67
5 95.9716 0.0355
6 16.3270 0.8559 1.83481 42.72
7 31.2796 (D7)
8 ASPH 17.6748 0.0474 1.53610 41.20
9 11.7523 0.1896 1.88300 40.80
10 2.1934 1.5313
11 -3.3743 0.1422 1.88300 40.80
12 -14.2180 0.0355
13 26.5108 0.1422 1.90366 31.31
14 9.6641 0.6703 1.94595 17.98
15 -9.6641 (D15)
Aperture 0.0000 1.1848
17 ASPH 3.4609 0.7833 1.68893 31.16
18 44.0876 0.1422 1.80610 33.27
19 3.6 180 0.5368
20 8.0360 0.1422 1.80610 33.27
21 4.9364 0.7131 1.48749 70.44
22 -15.9885 3.6402
23 ASPH 3.3850 1.5006 1.69350 53.34
24 ASPH -8.8783 0.0355
25 -20.0260 0.1422 1.83400 37.34
26 2.4171 1.1653 1.49700 81.61
27 -7.7420 (D27)
28 0.0000 0.1019 1.51680 64.20
29 0.0000 0.4645 1.61800 63.39
30 0.0000 0.2915
31 0.0000 0.4028 1.51680 64.20
32 0.0000 3.6730 1.51680 64.20
33 0.0000 0.00
非球面係数
NO 8
K :0.000000
A :0.455156E-02 B :-.351639E-03 C :0.207200E-04 D :-.141884E-05
NO 17
K :0.000000
A :-.599626E-03 B :-.315997E-04 C :-.512130E-05 D :-.300620E-06
NO 23
K :0.000000
A :-.467940E-03 B :-.302658E-03 C :0.654116E-04 D :-.204795E-05
NO 24
K :0.000000
A :0.411688E-02 B :-.619840E-03 C :0.162231E-03 D :-.120261E-04
Aspheric coefficient
NO 8
K: 0.000000
A: 0.455156E-02 B:-. 351639E-03 C: 0.207200E-04 D:-. 141884E-05
NO 17
K: 0.000000
A:-. 599626E-03 B:-. 315997E-04 C:-. 512130E-05 D:-. 300620E-06
NO 23
K: 0.000000
A:-. 467940E-03 B:-. 302658E-03 C: 0.654116E-04 D:-. 204795E-05
NO 24
K: 0.000000
A: 0.411688E-02 B:-. 619840E-03 C: 0.162231E-03 D:-. 120261E-04
焦点距離 1.000 4.500 19.042
Ｆナンバー 1.65 2.60 3.60
2ω 76.76 18.52 4.487
D7 0.2133 8.5862 12.6312
D15 12.8918 4.5189 0.4739
D22 3.6402 2.2958 2.0626
D27 0.4803 1.8247 2.0578
Focal length 1.000 4.500 19.042
F number 1.65 2.60 3.60
2ω 76.76 18.52 4.487
D7 0.2133 8.5862 12.6312
D15 12.8918 4.5189 0.4739
D22 3.6402 2.2958 2.0626
D27 0.4803 1.8247 2.0578
第３実施形態の広角防振ズームレンズは、図１１に示すように、ズーム作動によって第２レンズ群Ｇ２ないし第４レンズ群Ｇ４が移動する。表２のＤ７，Ｄ１５，Ｄ２２，Ｄ２７は、ズーム作動における各焦点距離における間隔を示す。図１１（ａ）は焦点距離１（ｍｍ）の状態を示し、図１１（ｂ）は焦点距離４．５０００（ｍｍ）の状態を示し、図１１（ｃ）は焦点距離１９．０４２（ｍｍ）の状態を示す。 As shown in FIG. 11, in the wide-angle image stabilization zoom lens according to the third embodiment, the second lens group G2 to the fourth lens group G4 are moved by the zoom operation. D7, D15, D22, and D27 in Table 2 indicate intervals at each focal length in the zoom operation. FIG. 11A shows a state with a focal length of 1 (mm), FIG. 11B shows a state with a focal length of 4.5000 (mm), and FIG. 11C shows a focal length of 19.042 (mm). Shows the state.
第３実施形態の広角防振ズームレンズの収差を、図２ないし図５に準じた図１２ないし図１５に示す。
図１２は、広角端（焦点距離１ｍｍ）における収差を示し、（ａ）は球面収差、（ｂ）は非点収差、（ｃ）は歪曲収差を示す。
図１３は、望遠端（焦点距離１９．０４２ｍｍ）における収差を示し、（ａ）は球面収差、（ｂ）は非点収差、（ｃ）は歪曲収差を示す。
The aberrations of the wide-angle image stabilization zoom lens according to the third embodiment are shown in FIGS. 12 to 15 according to FIGS.
FIG. 12 shows aberrations at the wide-angle end (focal length 1 mm), (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.
FIG. 13 shows aberrations at the telephoto end (focal length 19.042 mm), (a) shows spherical aberration, (b) shows astigmatism, and (c) shows distortion.
図１４は、広角端（焦点距離１ｍｍ）におけるコマ収差を示し、（ａ）は入射角度（半画角）３８．３８°、（ｂ）は入射角度（半画角）２８．６１°、（ｃ）は入射角度（半画角）２０．９４°、（ｄ）は入射角度（半画角）０°である。 FIG. 14 shows coma aberration at the wide angle end (focal length 1 mm), (a) is an incident angle (half angle of view) 38.38 °, (b) is an incident angle (half angle of view) 28.61 °, ( c) is an incident angle (half angle of view) of 20.94 °, and (d) is an incident angle (half angle of view) of 0 °.
図１５は、望遠端（焦点距離１９．０４２ｍｍ）におけるコマ収差を示し、（ａ）は入射角度（半画角）２．２４３°、（ｂ）は入射角度（半画角）１．５７０°、（ｃ）は入射角度（半画角）１．１２１°、（ｄ）は入射角度（半画角）０°である。 FIG. 15 shows coma aberration at the telephoto end (focal length 19.042 mm), (a) is an incident angle (half angle of view) 2.243 °, and (b) is an incident angle (half angle of view) 1.570 °. , (C) is an incident angle (half angle of view) of 1.121 °, and (d) is an incident angle (half angle of view) of 0 °.
第３実施形態の条件式（１）はH31＞H32、条件式（２）は（R31−R32）／（R31＋R32）＝−０．０２２２である。 Conditional expression (1) of the third embodiment is H31> H32, and conditional expression (2) is (R31−R32) / (R31 + R32) = − 0.0222.
引用文献１の実施形態１の条件式（１）はH31＜H32、条件式（２）の値は−０．６３６である。
引用文献１の実施形態２の条件式（１）はH31＜H32、条件式（２）の値は−０．４０５である。
引用文献１の実施形態３の条件式（１）はH31＜H32、条件式（２）の値は−０．５３３である。
引用文献１の実施形態４の条件式（１）はH31＜H32、条件式（２）の値は−０．４８１である。
Conditional expression (1) of Embodiment 1 of cited document 1 is H31 <H32, and the value of conditional expression (2) is −0.636.
Conditional expression (1) of Embodiment 2 of cited document 1 is H31 <H32, and the value of conditional expression (2) is −0.405.
The conditional expression (1) of Embodiment 3 of the cited document 1 is H31 <H32, and the value of the conditional expression (2) is −0.533.
Conditional expression (1) of Embodiment 4 of cited document 1 is H31 <H32, and the value of conditional expression (2) is −0.481.
引用文献２の実施形態１の条件式（１）はH31＜H32、条件式（２）の値は−０．１４２である。
引用文献２の実施形態２の条件式（１）はH31＜H32、条件式（２）の値は−０．２２２である。
引用文献２の実施形態３の条件式（１）はH31＜H32、条件式（２）の値は−０．２４５である。
Conditional expression (1) of Embodiment 1 of cited document 2 is H31 <H32, and the value of conditional expression (2) is −0.142.
Conditional expression (1) of Embodiment 2 of cited document 2 is H31 <H32, and the value of conditional expression (2) is -0.222.
Conditional expression (1) of Embodiment 3 of cited document 2 is H31 <H32, and the value of conditional expression (2) is −0.245.
引用文献３の実施形態１の条件式（１）はH31＜H32、条件式（２）の値は−０．１４４である。
引用文献３の実施形態２の条件式（１）はH31＜H32、条件式（２）の値は−０．２３１である。
引用文献３の実施形態３の条件式（１）はH31＜H32、条件式（２）の値は−０．１６０である。
引用文献３の実施形態４の条件式（１）はH31＜H32、条件式（２）の値は−０．１６５である。
引用文献３の実施形態５の条件式（１）はH31＜H32、条件式（２）の値は−０．１６１である。
引用文献３の実施形態６の条件式（１）はH31＜H32、条件式（２）の値は−０．０８９である。
引用文献３の実施形態７の条件式（１）はH31＜H32、条件式（２）の値は−０．３００である。
。
In conditional expression (1) of Embodiment 1 of Cited Document 3, H31 <H32, and the value of conditional expression (2) is −0.144.
Conditional expression (1) of Embodiment 2 of cited document 3 is H31 <H32, and the value of conditional expression (2) is −0.231.
In conditional expression (1) of Embodiment 3 of cited document 3, H31 <H32, and the value of conditional expression (2) is −0.160.
Conditional expression (1) of Embodiment 4 of cited document 3 is H31 <H32, and the value of conditional expression (2) is -0.165.
Conditional expression (1) of
Conditional expression (1) of Embodiment 6 of cited document 3 is H31 <H32, and the value of conditional expression (2) is -0.089.
In conditional expression (1) of Embodiment 7 of Cited Document 3, H31 <H32, and the value of conditional expression (2) is −0.300.
.
Ｌ レンズ
Ｇ レンズ群
Ｓ 絞り
Ｆ フィルタ
Ｐ プリズム
L Lens G Lens group S Aperture F Filter P Prism
Claims (2)
上記第3レンズ群は凸凹接合レンズの固定群L31と凹凸接合レンズ群L32とにより構成され、L32を光軸に垂直な方向にシフトすることにより、像をシフトさせ、また、前記固定群L31は、最も物体側に強い凸面を向け、最も像面側に強い凹面を向けて構成され、
条件式（１） H31＞H32
H31：広角端で3群の固定群の最も物体側レンズ面の軸上の上光線の入射光線高さ
H32：広角端で3群の防振群の最も物体側レンズ面の軸上の上光線の入射光線高さ
条件式（２） −0.12＜（R31−R32）／（R31＋R32）＜0.12
R31：第3レンズ群の固定群の最も物体側の凸面の曲率半径
R32：第3レンズ群の固定群の最も像面側の凹面の曲率半径
を満たす広角防振ズームレンズ。 In order from the object side to the image surface side, the first lens group G1 having a positive refractive power, the second lens group G2 having a negative refractive power, the third lens group G3 having a positive refractive power, and the first lens group G3 having a positive refractive power. When the lens position changes from the wide-angle end to the telephoto end, the second lens group G2 moves to the image side, and the fourth lens group G4 includes the fourth lens group G4. The first lens group G1 and the third lens group G3 are fixed in the direction of the optical axis, and moved so as to compensate for fluctuations in the image plane position.
The third lens group is composed of a convex-concave cemented lens fixed group L31 and a concave-convex cemented lens group L32.The image is shifted by shifting L32 in a direction perpendicular to the optical axis, and the fixed group L31 is , With the strong convex surface facing the most object side and the strong concave surface facing the most image side,
Conditional expression (1) H31> H32
H31: Incident ray height of the upper ray on the axis of the most object side lens surface of the three fixed groups at the wide angle end
H32: Incident ray height of the upper ray on the axis of the most object side lens surface of the three anti-vibration groups at the wide angle end Conditional expression (2) −0.12 <(R31−R32) / (R31 + R32) <0.12
R31: Radius of curvature of the convex surface closest to the object side in the fixed group of the third lens group
R32: A wide-angle image stabilization zoom lens that satisfies the radius of curvature of the concave surface closest to the image plane in the fixed group of the third lens group.
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| JP2008147128A JP5234335B2 (en) | 2008-06-04 | 2008-06-04 | Wide angle anti-vibration zoom lens |
| US12/457,141 US7965452B2 (en) | 2008-06-04 | 2009-06-02 | High magnification compact zoom lens |
| US13/108,619 US8305695B2 (en) | 2008-06-04 | 2011-05-16 | High magnification compact zoom lens |
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| CN104395809B (en) * | 2012-07-05 | 2016-08-24 | 富士胶片株式会社 | Zoom lens and camera head |
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| JP2001281545A (en) * | 1999-10-06 | 2001-10-10 | Canon Inc | Zoom lens and optical equipment using the same |
| JP4438046B2 (en) * | 2003-08-11 | 2010-03-24 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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